John or James?  Different records have different names, although baptised at Atherton on the same day be the same parents.

John, Aged 56 in 1841 at Tyldesley
John, Aged 69 in 1851 when buried

Name    John Mather
Event Type    Baptism
Baptism Date    18 Aug 1782
Baptism Place    Leigh, St Mary, Lancashire, England
Parish as it Appears    Atherton
Father    Thos Mather
Mother    Betty Mather
Reference Number    GB127.L211/1/2/1

John son of Tho's Mather, weaver and Betty his wife of Atherton

Name:    James Mather
Event Type:    Baptism
Baptism Date:    18 Aug 1782
Baptism Place:    Atherton, St John the Baptist, Lancashire, England
Father:    Thos Mather
Mother:    Elizabeth Mather
Reference Number:    GB127.L177/1/1

James, son of Tho's Mather, weaver & Elizabeth his wife

John died between 1841 and 1851.  There is only one death in Atherton or Tydlesley:

Lancashire Death indexes for the years: 1851
MATHER    John    69    Atherton    ATH/7/90

Burial: 13 Mar 1851 Peel Chapel, Little Hulton, Lancashire, England
John Mather -
    Age: 69 yrs
    Abode: Tyldesley
    Buried by: T. Airey P.C.
    Register: Burials 1836 - 1852, Page 180, Entry 1438
    Source: LDS Film 1885715

or;
Name    John Mather
Age    54
Birth Date    abt 1781
Burial Date    27 Dec 1835
Burial Place    Leigh, St Mary the Virgin, Lancashire, England
Parish as it Appears    Leigh, Atherton
Reference Number    GB127.L211/1/5/3
John Mather of Little Bolton, aged 54

Aged 29 when buried

Name:    Ann Mather
Age:    29
Birth Date:    abt 1790
Burial Date:    9 Apr 1819
Burial Place:    Atherton, St John the Baptist, Lancashire, England
Spouse:    John Mather
Reference Number:    GB127.L177/1/4/1

Abode: Atherton

Name:    Elisha Matther
Baptism Date:    28 Jun 1817
Baptism Place:    Leigh, St Mary, Lancashire, England
Father:    John Matther
Mother:    Ann Matther
Reference Number:    GB127.L211/1/3/1

Name:    Elisha Mather
Gender:    Male
Marital Status:    Single
Death Date:    abt 1817
Burial Date:    7 Jul 1817
Burial Place:    Atherton, Leigh, Lancashire, England
Father:    John Mather
Mother:    Anne Mather
FHL Film Number:    1885671
Reference ID:    p 27 n 216

Elisha, Son of John and Ann Mather, Weaver, Atherton, July 7 - Infant

Name    Elisha Mather
Death Date    1817
Cemetery    St. John the Baptist Churchyard
Burial or Cremation Place    Atherton, Borough of Wigan
Has Bio?    N
URL    https://www.findagrave.com/memorial/240559355/elisha-mather
Inscription    Son of John Mather & Ann